package com.devg.file.web.base.config;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Intercepts({
    @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
    @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})
})
public class MybatisInterceptor implements Interceptor {

  private static final Logger log = LoggerFactory.getLogger(MybatisInterceptor.class);

  @Override
  public Object intercept(Invocation invocation) throws Throwable {
    MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
    Object parameter = null;
    if (invocation.getArgs().length > 1) {
      parameter = invocation.getArgs()[1];
    }
    BoundSql boundSql = mappedStatement.getBoundSql(parameter);
    Configuration configuration = mappedStatement.getConfiguration();
    Object returnVal = invocation.proceed();
    //获取sql语句
    String sql = getSql(configuration, boundSql);
    log.info("Mybatis 拦截器获取SQL:{}",sql);
    return returnVal;
  }

  @Override
  public Object plugin(Object target) {
    return Plugin.wrap(target, this);
  }

  @Override
  public void setProperties(Properties properties) {

  }

  /**
   * 获取SQL
   * @param configuration
   * @param boundSql
   * @return
   */
  private String getSql(Configuration configuration, BoundSql boundSql) {
    Object parameterObject = boundSql.getParameterObject();
    List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
    String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
    if (parameterObject == null || parameterMappings.size() == 0) {
      return sql;
    }
    TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
    if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
      sql = sql.replaceFirst("\\?", getParameterValue(parameterObject));
    } else {
      MetaObject metaObject = configuration.newMetaObject(parameterObject);
      for (ParameterMapping parameterMapping : parameterMappings) {
        String propertyName = parameterMapping.getProperty();
        if (metaObject.hasGetter(propertyName)) {
          Object obj = metaObject.getValue(propertyName);
          sql = sql.replaceFirst("\\?", getParameterValue(obj));
        } else if (boundSql.hasAdditionalParameter(propertyName)) {
          Object obj = boundSql.getAdditionalParameter(propertyName);
          sql = sql.replaceFirst("\\?", getParameterValue(obj));
        }
      }
    }
    return sql;
  }

  private String getParameterValue(Object obj) {
    String value = null;
    if (obj instanceof String) {
      value = "'" + obj.toString() + "'";
    } else if (obj instanceof Date) {
      DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
      value = "'" + formatter.format(obj) + "'";
    } else {
      if (obj != null) {
        value = obj.toString();
      } else {
        value = "";
      }
    }
    return value;
  }
}
